GENERAL INDEX 



313 



Rare plants. See Aliens, Alpines, 

 Discontinuous, and Lusitanian 

 floras 

 Raspberry: fr., 192; acid in, 143; 



suckers, 155 

 Receptacle, *163 

 Reduction in structure, 206 

 Reed : common (see Phragmites) ; 



-mace (see Typha) 

 Reeds, 62 ; position of leaves in 



relation to light, 46 ; pollination, 



167 

 Reed-swamp, 225, 230, 241 ; zoning 



of, 242 



Reed-type of leaf, 43 

 Reindeer-moss, 22 

 Reproduction : of maritime aquatics, 



275 ; by seed, 153, 162 ; vegeta- 



tive, 153, 154 

 Resin, 142 

 Respiration, 6, 7, 78 ; of aquatics, 



48, 50, 52 ; of roots, 88 

 Rest-harrow, thorns, 44 

 Retrogression, 206 

 Reversal-point in tendrils, 115 

 Rhinanthus, 60 ; parasitic nature, 



126 

 Rhizomes, 62, *110; food-reserves 



in, 150 ; multiplication by, 161 

 Rhododendron, leaf-form, 43 

 Rhubarb, 152 ; calcium oxalate in, 



143 ; culinary, 150 

 Ribbon-type of leaf in aquatics, 50, 



51 



Ribes, 215 ; bud-protection, 61 

 Rice : food, 147 ; -starch, 146 

 River-banks, veg. of, 243 

 Rivers, veg. of, 235 

 Robinia spines, 140, *141 

 Rock-cress (see Arabis) ; -rose, 169 

 Rocks : alpine, veg. of, 286 ; classifi- 

 cation of, 82 ; denudation of, 80 ; 



limestone-, veg. of, 290 ; lowland-, 



veg. of, 290 ; maritime, 231, veg. 



of, 283 ; sub-alpine, veg. of, 290 ; 



xerophytic factors of, 35 

 Rocky summits, veg. of, 289 

 Rolled-leaves, 40, *41, *43 

 Root-absorption, 25 ; -climbers, 119 ; 



-crops, 21, 98 ; -hairs, *25, 49, 



91 ; -nodules, *44, *95, 97, 98, 



symbiosis, 133 ; -stock, 38, 62, 



110 ; -tubers, 111 

 Rootless plants, 49, 131, *132 ; 



Corallorhiza, 124 

 Roots : of aquatics, 49 ; clasping, 



121 ; fleshy, 150 



Rosa canina, climber, 116 ; spinos- 



issima, prickles, 116 

 Rose, 220 ; bud-protection, 61 ; bud- 



scales, 61 ; fl., 168 ; fr., 193 ; 



moss-, 116; prickles, 116, 141; 



suckers, 155 

 Rosemary oil, 42, 151 

 Rosette-habit, *37, *62 ; pis., 60, 



115 



Rotation : of crops, 97 ; -grasses, 20 

 Rubber, 142, 152 

 Rubus, 220 ; scrambler, 116. See 



Bramble 

 Rum, 151 



Rumex, pollination, 167 

 Runners, 155, 161 

 Rupture-wort, 218 

 Russia, 12, 21, 22 

 Rye, 147 



Sage oil, 42, 143 



Sagittaria, heterophylly, 52 ; winter- 

 buds, 54 



Sago-palm, food, 150 ; yield per 

 acre, 149 



Sainfoin, fr., 188, * 189 



St. Dabeoc's-heath, 213, 217 



St. John's-wort, 217 ; fl., 169 



Salicornia, 41, 58, 59, 88, 278; 

 -association, 277, 278 



Salix, 220. See Willow 



Salsola Kali, 59 



Salt : common, 88 ; effect on absorp- 

 tion, 33, 88 ; -marsh, veg. of, 231, 

 278 ; -meadow, 279 ; -swamps 

 and marshes, xerophytic factors 

 of, 35 



Saltwort. See Salsola Kali 



Salty seaside soils, 35 



Samara, 186, *187, 190 



Sand, 82 ; absorptive power, 87 ; 

 origin from granite, 81 ; per- 

 meability, 87 ; physical properties* 

 81, 90 ; water-capacity, 87 ; water- 

 retaining capacity, 87 



Sand-dunes, 16, 82, 90 ; formation 

 of, 279 ; fixed, veg. of, 230 ; ridges, 

 veg. of, 231 ; veg. of, 58, 59, 107, 

 225 



Sandstone-hills, veg. of, 257 



Sandy loam, 82 ; soils, 35 



Saprophytes, 6, *123, 206 ; partial, 

 125 ; total, 124 ; of woods, 266 



Sarsaparilla. See Smttax 



Savannah, 17. See Park-land 



Saxifraga Geum, 213, 221 ; granu- 

 lata, 62, bulbils, 160 ; Ursula, 213 ; 



